OMGeeky/tarpc
1
0
Fork 0
mirror of https://github.com/OMGeeky/tarpc.git synced 2025-12-31 16:44:31 +01:00
Code Issues Packages Projects Releases Wiki Activity

WIP multiplex Parse/Serialize/FramedIo impls

Browse Source
This commit is contained in:
Tim Kuehn
2016-09-15 02:38:07 -07:00
parent 8c0181633d
commit 20d1a019ae
16 changed files with 525 additions and 603 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
examples/concurrency.rs
View File

@@ -59,7 +59,7 @@ fn run_once(clients: &[FutureClient], concurrency: u32, print: bool) {
.take(concurrency as usize)
.map(|client| {
let start = SystemTime::now();
let future = client.read(&CHUNK_SIZE).map(move |_| start.elapsed().unwrap());
let future = client.read(CHUNK_SIZE).map(move |_| start.elapsed().unwrap());
thread::yield_now();
future
})

10
examples/pubsub.rs
View File

@@ -65,7 +65,7 @@ impl Subscriber {
.listen("localhost:0")
.wait()
.unwrap();
publisher.subscribe(&id, &subscriber.local_addr()).unwrap();
publisher.subscribe(id, *subscriber.local_addr()).unwrap();
subscriber
}
}
@@ -90,7 +90,7 @@ impl publisher::FutureService for Publisher {
.unwrap()
.values()
// Ignore failing subscribers.
.map(move |client| client.receive(&message).then(|_| Ok(())))
.map(move |client| client.receive(message.clone()).then(|_| Ok(())))
.collect::<Vec<_>>())
.map(|_| ())
.boxed()
@@ -127,8 +127,8 @@ fn main() {
let _subscriber2 = Subscriber::new(1, publisher.clone());
println!("Broadcasting...");
publisher.broadcast(&"hello to all".to_string()).unwrap();
publisher.unsubscribe(&1).unwrap();
publisher.broadcast(&"hello again".to_string()).unwrap();
publisher.broadcast("hello to all".to_string()).unwrap();
publisher.unsubscribe(1).unwrap();
publisher.broadcast("hello again".to_string()).unwrap();
thread::sleep(Duration::from_millis(300));
}

2
examples/readme.rs
View File

@@ -30,5 +30,5 @@ fn main() {
let addr = "localhost:10000";
let _server = HelloServer.listen(addr);
let client = SyncClient::connect(addr).unwrap();
println!("{}", client.hello(&"Mom".to_string()).unwrap());
println!("{}", client.hello("Mom".to_string()).unwrap());
}

4
examples/readme2.rs
View File

@@ -52,6 +52,6 @@ fn main() {
let addr = "localhost:10000";
let _server = HelloServer.listen(addr);
let client = SyncClient::connect(addr).unwrap();
println!("{}", client.hello(&"Mom".to_string()).unwrap());
println!("{}", client.hello(&"".to_string()).unwrap_err());
println!("{}", client.hello("Mom".to_string()).unwrap());
println!("{}", client.hello("".to_string()).unwrap_err());
}

4
examples/server_calling_server.rs
View File

@@ -54,7 +54,7 @@ impl DoubleFutureService for DoubleServer {
fn double(&self, x: i32) -> Self::DoubleFut {
self.client
.add(&x, &x)
.add(x, x)
.map_err(|e| e.to_string().into())
.boxed()
}
@@ -68,6 +68,6 @@ fn main() {
let double_client = double::SyncClient::connect(double.local_addr()).unwrap();
for i in 0..5 {
println!("{:?}", double_client.double(&i).unwrap());
println!("{:?}", double_client.double(i).unwrap());
}
}

6
examples/two_clients.rs
View File

@@ -63,14 +63,14 @@ fn main() {
let bar_client = bar::SyncClient::connect(bar.local_addr()).unwrap();
let baz_client = baz::SyncClient::connect(baz.local_addr()).unwrap();
info!("Result: {:?}", bar_client.bar(&17));
info!("Result: {:?}", bar_client.bar(17));
let total = 20;
for i in 1..(total + 1) {
if i % 2 == 0 {
info!("Result 1: {:?}", bar_client.bar(&i));
info!("Result 1: {:?}", bar_client.bar(i));
} else {
info!("Result 2: {:?}", baz_client.baz(&i.to_string()));
info!("Result 2: {:?}", baz_client.baz(i.to_string()));
}
}

70
src/client.rs
View File

@@ -3,8 +3,9 @@
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use Packet;
use futures::{Async, BoxFuture};
use WireError;
use bincode::serde::DeserializeError;
use futures::{Async, BoxFuture, Future};
use futures::stream::Empty;
use std::fmt;
use std::io;
@@ -16,27 +17,44 @@ use util::Never;
///
/// Typically, this would be combined with a serialization pre-processing step
/// and a deserialization post-processing step.
#[derive(Clone)]
pub struct Client {
inner: pipeline::Client<Packet, Vec<u8>, Empty<Never, io::Error>, io::Error>,
pub struct Client<Req, Resp, E> {
inner: pipeline::Client<Req,
Result<Result<Resp, WireError<E>>,
DeserializeError>,
Empty<Never, io::Error>,
io::Error>,
}
impl Service for Client {
type Request = Packet;
type Response = Vec<u8>;
impl<Req, Resp, E> Clone for Client<Req, Resp, E> {
fn clone(&self) -> Self {
Client { inner: self.inner.clone() }
}
}
impl<Req, Resp, E> Service for Client<Req, Resp, E>
where Req: Send + 'static,
Resp: Send + 'static,
E: Send + 'static,
{
type Request = Req;
type Response = Result<Resp, ::Error<E>>;
type Error = io::Error;
type Future = BoxFuture<Vec<u8>, io::Error>;
type Future = BoxFuture<Self::Response, Self::Error>;
fn poll_ready(&self) -> Async<()> {
Async::Ready(())
}
fn call(&self, request: Packet) -> Self::Future {
fn call(&self, request: Self::Request) -> Self::Future {
self.inner.call(pipeline::Message::WithoutBody(request))
.map(|r| r.map(|r| r.map_err(::Error::from))
.map_err(::Error::ClientDeserialize)
.and_then(|r| r))
.boxed()
}
}
impl fmt::Debug for Client {
impl<Req, Resp, E> fmt::Debug for Client<Req, Resp, E> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(f, "Client {{ .. }}")
}
@@ -45,7 +63,8 @@ impl fmt::Debug for Client {
/// Exposes a trait for connecting asynchronously to servers.
pub mod future {
use futures::{self, Async, Future};
use protocol::{LOOP_HANDLE, TarpcTransport};
use protocol::{LOOP_HANDLE, new_transport};
use serde::{Deserialize, Serialize};
use std::cell::RefCell;
use std::io;
use std::net::SocketAddr;
@@ -64,12 +83,12 @@ pub mod future {
}
/// A future that resolves to a `Client` or an `io::Error`.
pub struct ClientFuture {
inner: futures::Oneshot<io::Result<Client>>,
pub struct ClientFuture<Req, Resp, E> {
inner: futures::Oneshot<io::Result<Client<Req, Resp, E>>>,
}
impl Future for ClientFuture {
type Item = Client;
impl<Req, Resp, E> Future for ClientFuture<Req, Resp, E> {
type Item = Client<Req, Resp, E>;
type Error = io::Error;
fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
@@ -81,12 +100,16 @@ pub mod future {
}
}
impl Connect for Client {
type Fut = ClientFuture;
impl<Req, Resp, E> Connect for Client<Req, Resp, E>
where Req: Serialize + Send + 'static,
Resp: Deserialize + Send + 'static,
E: Deserialize + Send + 'static,
{
type Fut = ClientFuture<Req, Resp, E>;
/// Starts an event loop on a thread and registers a new client
/// connected to the given address.
fn connect(addr: &SocketAddr) -> ClientFuture {
fn connect(addr: &SocketAddr) -> ClientFuture<Req, Resp, E> {
let addr = *addr;
let (tx, rx) = futures::oneshot();
LOOP_HANDLE.spawn(move |handle| {
@@ -95,7 +118,7 @@ pub mod future {
.and_then(move |tcp| {
let tcp = RefCell::new(Some(tcp));
let c = try!(pipeline::connect(&handle2, move || {
Ok(TarpcTransport::new(tcp.borrow_mut().take().unwrap()))
Ok(new_transport(tcp.borrow_mut().take().unwrap()))
}));
Ok(Client { inner: c })
})
@@ -109,6 +132,7 @@ pub mod future {
/// Exposes a trait for connecting synchronously to servers.
pub mod sync {
use futures::Future;
use serde::{Deserialize, Serialize};
use std::io;
use std::net::ToSocketAddrs;
use super::Client;
@@ -119,7 +143,11 @@ pub mod sync {
fn connect<A>(addr: A) -> Result<Self, io::Error> where A: ToSocketAddrs;
}
impl Connect for Client {
impl<Req, Resp, E> Connect for Client<Req, Resp, E>
where Req: Serialize + Send + 'static,
Resp: Deserialize + Send + 'static,
E: Deserialize + Send + 'static,
{
fn connect<A>(addr: A) -> Result<Self, io::Error>
where A: ToSocketAddrs
{

25
src/errors.rs
View File

@@ -7,13 +7,11 @@ use bincode;
use serde::{Deserialize, Serialize};
use std::{fmt, io};
use std::error::Error as StdError;
use tokio_proto::pipeline;
use tokio_proto::{multiplex, pipeline};
/// All errors that can occur during the use of tarpc.
#[derive(Debug)]
pub enum Error<E>
where E: SerializableError
{
pub enum Error<E> {
/// Any IO error.
Io(io::Error),
/// Error in deserializing a server response.
@@ -78,7 +76,7 @@ impl<E: SerializableError> StdError for Error<E> {
}
}
impl<E: SerializableError> From<pipeline::Error<Error<E>>> for Error<E> {
impl<E> From<pipeline::Error<Error<E>>> for Error<E> {
fn from(err: pipeline::Error<Error<E>>) -> Self {
match err {
pipeline::Error::Transport(e) => e,
@@ -87,13 +85,22 @@ impl<E: SerializableError> From<pipeline::Error<Error<E>>> for Error<E> {
}
}
impl<E: SerializableError> From<io::Error> for Error<E> {
impl<E> From<multiplex::Error<Error<E>>> for Error<E> {
fn from(err: multiplex::Error<Error<E>>) -> Self {
match err {
multiplex::Error::Transport(e) => e,
multiplex::Error::Io(e) => e.into(),
}
}
}
impl<E> From<io::Error> for Error<E> {
fn from(err: io::Error) -> Self {
Error::Io(err)
}
}
impl<E: SerializableError> From<WireError<E>> for Error<E> {
impl<E> From<WireError<E>> for Error<E> {
fn from(err: WireError<E>) -> Self {
match err {
WireError::ServerDeserialize(s) => Error::ServerDeserialize(s),
@@ -106,9 +113,7 @@ impl<E: SerializableError> From<WireError<E>> for Error<E> {
/// A serializable, server-supplied error.
#[doc(hidden)]
#[derive(Deserialize, Serialize, Clone, Debug)]
pub enum WireError<E>
where E: SerializableError
{
pub enum WireError<E> {
/// Error in deserializing a client request.
ServerDeserialize(String),
/// Error in serializing server response.

9
src/lib.rs
View File

@@ -54,7 +54,7 @@
//! let addr = "localhost:10000";
//! let _server = HelloServer.listen(addr);
//! let client = SyncClient::connect(addr).unwrap();
//! println!("{}", client.hello(&"Mom".to_string()).unwrap());
//! println!("{}", client.hello("Mom".to_string()).unwrap());
//! }
//! ```
//!
@@ -62,7 +62,6 @@
#![feature(plugin, question_mark, conservative_impl_trait, never_type, rustc_macro)]
#![plugin(tarpc_plugins)]
extern crate bincode;
extern crate byteorder;
extern crate bytes;
#[macro_use]
@@ -73,6 +72,8 @@ extern crate log;
extern crate serde_derive;
extern crate take;
#[doc(hidden)]
pub extern crate bincode;
#[doc(hidden)]
pub extern crate futures;
#[doc(hidden)]
@@ -94,9 +95,9 @@ pub use client::future::ClientFuture;
#[doc(hidden)]
pub use errors::{WireError};
#[doc(hidden)]
pub use protocol::{Packet, deserialize};
pub use protocol::{new_transport, Framed};
#[doc(hidden)]
pub use server::{ListenFuture, SerializeFuture, SerializedReply, listen, serialize_reply};
pub use server::{ListenFuture, Response, listen_pipeline};
/// Provides some utility error types, as well as a trait for spawning futures on the default event
/// loop.

294
src/macros.rs
View File

@@ -337,39 +337,42 @@ macro_rules! service {
rpc $fn_name:ident ( $( $arg:ident : $in_:ty ),* ) -> $out:ty | $error:ty;
)*
) => {
service! {
{ }
#[allow(non_camel_case_types, unused)]
#[derive(Debug)]
enum __tarpc_service_Request {
NotIrrefutable(()),
$(
$(#[$attr])*
rpc $fn_name( $( $arg : $in_ ),* ) -> $out | $error;
)*
{
#[allow(non_camel_case_types, unused)]
#[derive(Debug)]
enum __ClientSideRequest<'a> {
$(
$fn_name(&'a ( $(&'a $in_,)* ))
),*
}
impl_serialize!(__ClientSideRequest, { <'__a> }, $($fn_name(($($in_),*)))*);
}
$fn_name(( $($in_,)* ))
),*
}
};
// Pattern for when all return types and the client request have been expanded
(
{ } // none left to expand
$(
$(#[$attr:meta])*
rpc $fn_name:ident ( $( $arg:ident : $in_:ty ),* ) -> $out:ty | $error:ty;
)*
{
$client_req:item
$client_serialize_impl:item
impl_deserialize!(__tarpc_service_Request, NotIrrefutable(()) $($fn_name(($($in_),*)))*);
impl_serialize!(__tarpc_service_Request, {}, NotIrrefutable(()) $($fn_name(($($in_),*)))*);
#[allow(non_camel_case_types, unused)]
#[derive(Debug)]
enum __tarpc_service_Response {
NotIrrefutable(()),
$(
$fn_name($out)
),*
}
) => {
impl_deserialize!(__tarpc_service_Response, NotIrrefutable(()) $($fn_name($out))*);
impl_serialize!(__tarpc_service_Response, {}, NotIrrefutable(()) $($fn_name($out))*);
#[allow(non_camel_case_types, unused)]
#[derive(Debug)]
enum __tarpc_service_Error {
NotIrrefutable(()),
$(
$fn_name($error)
),*
}
impl_deserialize!(__tarpc_service_Error, NotIrrefutable(()) $($fn_name($error))*);
impl_serialize!(__tarpc_service_Error, {}, NotIrrefutable(()) $($fn_name($error))*);
/// Defines the `Future` RPC service. Implementors must be `Clone`, `Send`, and `'static`,
/// as required by `tokio_proto::NewService`. This is required so that the service can be used
@@ -399,7 +402,7 @@ macro_rules! service {
fn listen<L>(self, addr: L) -> $crate::ListenFuture
where L: ::std::net::ToSocketAddrs
{
return $crate::listen(addr, __tarpc_service_AsyncServer(self));
return $crate::listen_pipeline(addr, __tarpc_service_AsyncServer(self));
#[allow(non_camel_case_types)]
#[derive(Clone)]
@@ -411,30 +414,35 @@ macro_rules! service {
}
}
#[allow(non_camel_case_types)]
enum __tarpc_service_Reply<__tarpc_service_S: FutureService> {
DeserializeError($crate::SerializeFuture),
$($fn_name($crate::futures::Then<
$crate::futures::MapErr<
ty_snake_to_camel!(__tarpc_service_S::$fn_name),
fn($error) -> $crate::WireError<$error>>,
$crate::SerializeFuture,
fn(::std::result::Result<$out, $crate::WireError<$error>>)
-> $crate::SerializeFuture>)),*
type __tarpc_service_Future =
$crate::futures::Finished<$crate::Response<__tarpc_service_Response,
__tarpc_service_Error>,
::std::io::Error>;
#[allow(non_camel_case_types)]
enum __tarpc_service_FutureReply<__tarpc_service_S: FutureService> {
DeserializeError(__tarpc_service_Future),
$($fn_name($crate::futures::Then<ty_snake_to_camel!(__tarpc_service_S::$fn_name),
__tarpc_service_Future,
fn(::std::result::Result<$out, $error>)
-> __tarpc_service_Future>)),*
}
impl<S: FutureService> $crate::futures::Future for __tarpc_service_Reply<S> {
type Item = $crate::SerializedReply;
impl<S: FutureService> $crate::futures::Future for __tarpc_service_FutureReply<S> {
type Item = $crate::Response<__tarpc_service_Response, __tarpc_service_Error>;
type Error = ::std::io::Error;
fn poll(&mut self) -> $crate::futures::Poll<Self::Item, Self::Error> {
match *self {
__tarpc_service_Reply::DeserializeError(ref mut f) => {
$crate::futures::Future::poll(f)
__tarpc_service_FutureReply::DeserializeError(ref mut __tarpc_service_future) => {
$crate::futures::Future::poll(__tarpc_service_future)
}
$(
__tarpc_service_Reply::$fn_name(ref mut f) => {
$crate::futures::Future::poll(f)
__tarpc_service_FutureReply::$fn_name(ref mut __tarpc_service_future) => {
$crate::futures::Future::poll(__tarpc_service_future)
}
),*
}
@@ -447,66 +455,48 @@ macro_rules! service {
for __tarpc_service_AsyncServer<__tarpc_service_S>
where __tarpc_service_S: FutureService
{
type Request = ::std::vec::Vec<u8>;
type Response = $crate::SerializedReply;
type Request = ::std::result::Result<__tarpc_service_Request,
$crate::bincode::serde::DeserializeError>;
type Response = $crate::Response<__tarpc_service_Response, __tarpc_service_Error>;
type Error = ::std::io::Error;
type Future = __tarpc_service_Reply<__tarpc_service_S>;
type Future = __tarpc_service_FutureReply<__tarpc_service_S>;
fn poll_ready(&self) -> $crate::futures::Async<()> {
$crate::futures::Async::Ready(())
}
fn call(&self, __tarpc_service_req: Self::Request) -> Self::Future {
#[allow(non_camel_case_types, unused)]
#[derive(Debug)]
enum __tarpc_service_ServerSideRequest {
$(
$fn_name(( $($in_,)* ))
),*
}
impl_deserialize!(__tarpc_service_ServerSideRequest,
$($fn_name(($($in_),*)))*);
let __tarpc_service_request = $crate::deserialize(&__tarpc_service_req);
let __tarpc_service_request: __tarpc_service_ServerSideRequest =
match __tarpc_service_request {
::std::result::Result::Ok(__tarpc_service_request) => {
__tarpc_service_request
}
::std::result::Result::Err(__tarpc_service_e) => {
return __tarpc_service_Reply::DeserializeError(
deserialize_error(__tarpc_service_e));
}
};
match __tarpc_service_request {$(
__tarpc_service_ServerSideRequest::$fn_name(( $($arg,)* )) => {
const SERIALIZE:
fn(::std::result::Result<$out, $crate::WireError<$error>>)
-> $crate::SerializeFuture
= $crate::serialize_reply;
const TO_APP: fn($error) -> $crate::WireError<$error> =
$crate::WireError::App;
return __tarpc_service_Reply::$fn_name(
$crate::futures::Future::then(
$crate::futures::Future::map_err(
FutureService::$fn_name(&self.0, $($arg),*),
TO_APP),
SERIALIZE));
fn call(&self, __tarpc_service_request: Self::Request) -> Self::Future {
let __tarpc_service_request = match __tarpc_service_request {
Ok(__tarpc_service_request) => __tarpc_service_request,
Err(__tarpc_service_deserialize_err) => {
return __tarpc_service_FutureReply::DeserializeError(
$crate::futures::finished(
$crate::tokio_proto::pipeline::Message::WithoutBody(
::std::result::Result::Err(
$crate::WireError::ServerDeserialize(
::std::string::ToString::to_string(&__tarpc_service_deserialize_err))))));
}
)*}
#[inline]
fn deserialize_error<E: ::std::error::Error>(__tarpc_service_e: E)
-> $crate::SerializeFuture
{
$crate::serialize_reply(
// The type param is only used in the Error::App variant, so it
// doesn't matter what we specify it as here.
::std::result::Result::Err::<(), _>(
$crate::WireError::ServerDeserialize::<$crate::util::Never>(
__tarpc_service_e.to_string())))
};
match __tarpc_service_request {
__tarpc_service_Request::NotIrrefutable(()) => unreachable!(),
$(
__tarpc_service_Request::$fn_name(( $($arg,)* )) => {
fn __tarpc_service_wrap(
__tarpc_service_response: ::std::result::Result<$out, $error>)
-> __tarpc_service_Future
{
$crate::futures::finished($crate::tokio_proto::pipeline::Message::WithoutBody(
__tarpc_service_response
.map(__tarpc_service_Response::$fn_name)
.map_err(|__tarpc_service_error| $crate::WireError::App(__tarpc_service_Error::$fn_name(__tarpc_service_error)))
))
}
return __tarpc_service_FutureReply::$fn_name(
$crate::futures::Future::then(
FutureService::$fn_name(&self.0, $($arg),*),
__tarpc_service_wrap));
}
)*
}
}
}
@@ -622,7 +612,7 @@ macro_rules! service {
#[allow(unused)]
$(#[$attr])*
#[inline]
pub fn $fn_name(&self, $($arg: &$in_),*)
pub fn $fn_name(&self, $($arg: $in_),*)
-> ::std::result::Result<$out, $crate::Error<$error>>
{
let rpc = (self.0).$fn_name($($arg),*);
@@ -631,17 +621,36 @@ macro_rules! service {
)*
}
#[allow(non_camel_case_types)]
type __tarpc_service_Client = $crate::Client<__tarpc_service_Request, __tarpc_service_Response, __tarpc_service_Error>;
#[allow(non_camel_case_types)]
pub struct __tarpc_service_ConnectFuture<T> {
inner: $crate::futures::Map<$crate::ClientFuture<__tarpc_service_Request, __tarpc_service_Response, __tarpc_service_Error>, fn(__tarpc_service_Client) -> T>,
}
impl<T> $crate::futures::Future for __tarpc_service_ConnectFuture<T> {
type Item = T;
type Error = ::std::io::Error;
fn poll(&mut self) -> $crate::futures::Poll<Self::Item, Self::Error> {
$crate::futures::Future::poll(&mut self.inner)
}
}
#[allow(unused)]
#[derive(Clone, Debug)]
/// The client stub that makes RPC calls to the server. Exposes a Future interface.
pub struct FutureClient($crate::Client);
pub struct FutureClient(__tarpc_service_Client);
impl $crate::future::Connect for FutureClient {
type Fut = $crate::futures::Map<$crate::ClientFuture, fn($crate::Client) -> Self>;
type Fut = __tarpc_service_ConnectFuture<Self>;
fn connect(addr: &::std::net::SocketAddr) -> Self::Fut {
let client = <$crate::Client as $crate::future::Connect>::connect(addr);
$crate::futures::Future::map(client, FutureClient)
let client = <__tarpc_service_Client as $crate::future::Connect>::connect(addr);
__tarpc_service_ConnectFuture {
inner: $crate::futures::Future::map(client, FutureClient)
}
}
}
@@ -650,51 +659,46 @@ macro_rules! service {
#[allow(unused)]
$(#[$attr])*
#[inline]
pub fn $fn_name(&self, $($arg: &$in_),*)
pub fn $fn_name(&self, $($arg: $in_),*)
-> impl $crate::futures::Future<Item=$out, Error=$crate::Error<$error>>
+ 'static
{
$client_req
$client_serialize_impl
future_enum! {
enum Fut<C, F> {
Called(C),
Failed(F)
}
}
let __tarpc_service_args = ($($arg,)*);
let __tarpc_service_req = &__ClientSideRequest::$fn_name(&__tarpc_service_args);
let __tarpc_service_req =
match $crate::Packet::serialize(&__tarpc_service_req)
{
::std::result::Result::Err(__tarpc_service_e) => {
return Fut::Failed(
$crate::futures::failed(
$crate::Error::ClientSerialize(__tarpc_service_e)))
}
::std::result::Result::Ok(__tarpc_service_req) => __tarpc_service_req,
};
let __tarpc_service_req = __tarpc_service_Request::$fn_name(($($arg,)*));
let __tarpc_service_fut =
$crate::tokio_service::Service::call(&self.0, __tarpc_service_req);
Fut::Called($crate::futures::Future::then(__tarpc_service_fut,
$crate::futures::Future::then(__tarpc_service_fut,
move |__tarpc_service_msg| {
let __tarpc_service_msg: Vec<u8> = try!(__tarpc_service_msg);
let __tarpc_service_msg:
::std::result::Result<
::std::result::Result<$out, $crate::WireError<$error>>, _>
= $crate::deserialize(&__tarpc_service_msg);
let __tarpc_service_msg = try!(__tarpc_service_msg);
match __tarpc_service_msg {
::std::result::Result::Ok(__tarpc_service_msg) => {
::std::result::Result::Ok(try!(__tarpc_service_msg))
if let __tarpc_service_Response::$fn_name(__tarpc_service_msg) =
__tarpc_service_msg
{
::std::result::Result::Ok(__tarpc_service_msg)
} else {
unreachable!()
}
}
::std::result::Result::Err(__tarpc_service_e) => {
::std::result::Result::Err(
$crate::Error::ClientDeserialize(__tarpc_service_e))
::std::result::Result::Err(__tarpc_service_err) => {
::std::result::Result::Err(match __tarpc_service_err {
$crate::Error::App(__tarpc_service_err) => {
if let __tarpc_service_Error::$fn_name(__tarpc_service_err) =
__tarpc_service_err
{
$crate::Error::App(__tarpc_service_err)
} else {
unreachable!()
}
}
$crate::Error::ServerDeserialize(__tarpc_service_err) => $crate::Error::ServerDeserialize(__tarpc_service_err),
$crate::Error::ServerSerialize(__tarpc_service_err) => $crate::Error::ServerSerialize(__tarpc_service_err),
$crate::Error::ClientDeserialize(__tarpc_service_err) => $crate::Error::ClientDeserialize(__tarpc_service_err),
$crate::Error::ClientSerialize(__tarpc_service_err) => $crate::Error::ClientSerialize(__tarpc_service_err),
$crate::Error::Io(__tarpc_service_error) => $crate::Error::Io(__tarpc_service_error),
})
}
}
}))
})
}
)*
@@ -760,8 +764,8 @@ mod functional_test {
let _ = env_logger::init();
let handle = Server.listen("localhost:0");
let client = SyncClient::connect(handle.local_addr()).unwrap();
assert_eq!(3, client.add(&1, &2).unwrap());
assert_eq!("Hey, Tim.", client.hey(&"Tim".to_string()).unwrap());
assert_eq!(3, client.add(1, 2).unwrap());
assert_eq!("Hey, Tim.", client.hey("Tim".to_string()).unwrap());
}
#[test]
@@ -769,8 +773,8 @@ mod functional_test {
let handle = Server.listen("localhost:0");
let client1 = SyncClient::connect(handle.local_addr()).unwrap();
let client2 = client1.clone();
assert_eq!(3, client1.add(&1, &2).unwrap());
assert_eq!(3, client2.add(&1, &2).unwrap());
assert_eq!(3, client1.add(1, 2).unwrap());
assert_eq!(3, client2.add(1, 2).unwrap());
}
#[test]
@@ -814,8 +818,8 @@ mod functional_test {
let _ = env_logger::init();
let handle = Server.listen("localhost:0").wait().unwrap();
let client = FutureClient::connect(handle.local_addr()).wait().unwrap();
assert_eq!(3, client.add(&1, &2).wait().unwrap());
assert_eq!("Hey, Tim.", client.hey(&"Tim".to_string()).wait().unwrap());
assert_eq!(3, client.add(1, 2).wait().unwrap());
assert_eq!("Hey, Tim.", client.hey("Tim".to_string()).wait().unwrap());
}
#[test]
@@ -824,8 +828,8 @@ mod functional_test {
let handle = Server.listen("localhost:0").wait().unwrap();
let client1 = FutureClient::connect(handle.local_addr()).wait().unwrap();
let client2 = client1.clone();
assert_eq!(3, client1.add(&1, &2).wait().unwrap());
assert_eq!(3, client2.add(&1, &2).wait().unwrap());
assert_eq!(3, client1.add(1, 2).wait().unwrap());
assert_eq!(3, client2.add(1, 2).wait().unwrap());
}
#[test]

240
src/protocol.rs Normal file
View File

@@ -0,0 +1,240 @@
// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use serde;
use futures::{self, Async};
use bincode::{SizeLimit, serde as bincode};
use byteorder::BigEndian;
use bytes::{BlockBuf, BlockBufCursor, Buf, MutBuf};
use std::{cmp, io, mem, thread};
use std::marker::PhantomData;
use std::sync::mpsc;
use util::Never;
use tokio_core::io::{FramedIo, Io};
use tokio_core::reactor::{Core, Remote};
use tokio_proto::{self as proto, pipeline};
lazy_static! {
#[doc(hidden)]
pub static ref LOOP_HANDLE: Remote = {
let (tx, rx) = mpsc::channel();
thread::spawn(move || {
let mut lupe = Core::new().unwrap();
tx.send(lupe.handle().remote().clone()).unwrap();
// Run forever
lupe.run(futures::empty::<(), !>()).unwrap();
});
rx.recv().unwrap()
};
}
/// Handles the IO of tarpc messages.
pub struct Framed<I, In, Out> {
inner: proto::Framed<I, Parser<Out>, Serializer<In>>,
}
/// The type of message sent and received by the transport.
pub type Frame<T> = pipeline::Frame<T, Never, io::Error>;
impl<I, In, Out> FramedIo for Framed<I, In, Out>
where I: Io,
In: serde::Serialize,
Out: serde::Deserialize,
{
type In = Frame<In>;
type Out = Frame<Result<Out, bincode::DeserializeError>>;
fn poll_read(&mut self) -> Async<()> {
self.inner.poll_read()
}
fn poll_write(&mut self) -> Async<()> {
self.inner.poll_write()
}
fn read(&mut self) -> io::Result<Async<Self::Out>> {
self.inner.read()
}
fn write(&mut self, req: Self::In) -> io::Result<Async<()>> {
self.inner.write(req)
}
fn flush(&mut self) -> io::Result<Async<()>> {
self.inner.flush()
}
}
/// Constructs a new tarpc FramedIo
pub fn new_transport<I, In, Out>(upstream: I) -> Framed<I, In, Out>
where I: Io,
In: serde::Serialize,
Out: serde::Deserialize,
{
Framed {
inner: proto::Framed::new(upstream,
Parser::new(),
Serializer::new(),
BlockBuf::new(128, 8_192),
BlockBuf::new(128, 8_192))
}
}
struct Parser<T> {
state: ParserState,
_phantom_data: PhantomData<T>
}
enum ParserState {
Len,
Payload {
len: u64,
}
}
impl<T> Parser<T> {
fn new() -> Self {
Parser {
state: ParserState::Len,
_phantom_data: PhantomData,
}
}
}
impl<T> proto::Parse for Parser<T>
where T: serde::Deserialize,
{
type Out = Frame<Result<T, bincode::DeserializeError>>;
fn parse(&mut self, buf: &mut BlockBuf) -> Option<Self::Out> {
use self::ParserState::*;
loop {
match self.state {
Len if buf.len() < mem::size_of::<u64>() => return None,
Len => {
self.state = Payload { len: buf.buf().read_u64::<BigEndian>() };
buf.shift(mem::size_of::<u64>());
}
Payload { len } if buf.len() < len as usize => return None,
Payload { len } => {
match bincode::deserialize_from(&mut BlockBufReader::new(buf),
SizeLimit::Infinite)
{
Ok(msg) => {
buf.shift(len as usize);
self.state = Len;
return Some(pipeline::Frame::Message(Ok(msg)));
}
Err(err) => {
// Clear any unread bytes so we don't read garbage on next request.
let buf_len = buf.len();
buf.shift(buf_len);
return Some(pipeline::Frame::Message(Err(err)));
}
}
}
}
}
}
}
struct Serializer<T>(PhantomData<T>);
impl<T> Serializer<T> {
fn new() -> Self {
Serializer(PhantomData)
}
}
impl<T> proto::Serialize for Serializer<T>
where T: serde::Serialize,
{
type In = Frame<T>;
fn serialize(&mut self, msg: Self::In, buf: &mut BlockBuf) {
use tokio_proto::pipeline::Frame::*;
match msg {
Message(msg) => {
buf.write_u64::<BigEndian>(bincode::serialized_size(&msg));
bincode::serialize_into(&mut BlockBufWriter::new(buf),
&msg,
SizeLimit::Infinite)
// TODO(tikue): handle err
.expect("In bincode::serialize_into");
}
Error(e) => panic!("Unexpected error in Serializer::serialize: {}", e),
MessageWithBody(..) | Body(..) | Done => unreachable!(),
}
}
}
// == Scaffolding from Buf/MutBuf to Read/Write ==
struct BlockBufReader<'a> {
cursor: BlockBufCursor<'a>,
}
impl<'a> BlockBufReader<'a> {
fn new(buf: &'a mut BlockBuf) -> Self {
BlockBufReader { cursor: buf.buf() }
}
}
impl<'a> io::Read for BlockBufReader<'a> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let init_remaining = self.cursor.remaining();
let buf_len = buf.len();
self.cursor.read_slice(&mut buf[..cmp::min(init_remaining, buf_len)]);
Ok(init_remaining - self.cursor.remaining())
}
}
struct BlockBufWriter<'a> {
buf: &'a mut BlockBuf,
}
impl<'a> BlockBufWriter<'a> {
fn new(buf: &'a mut BlockBuf) -> Self {
BlockBufWriter { buf: buf }
}
}
impl<'a> io::Write for BlockBufWriter<'a> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.buf.write_slice(buf);
Ok(buf.len())
}
fn flush(&mut self) -> io::Result<()> {
// Always writes immediately, so there's never anything to flush.
Ok(())
}
}
#[test]
fn serialize() {
use tokio_proto::{Parse, Serialize};
const MSG: Frame<(char, char, char)> = pipeline::Frame::Message(('a', 'b', 'c'));
let mut buf = BlockBuf::default();
// Serialize twice to check for idempotence.
for _ in 0..2 {
Serializer::new().serialize(MSG, &mut buf);
let actual: Option<Frame<Result<(char, char, char), bincode::DeserializeError>>> = Parser::new().parse(&mut buf);
match actual {
Some(pipeline::Frame::Message(ref v)) if *v.as_ref().unwrap() == MSG.unwrap_msg() => {} // good,
bad => panic!("Expected {:?}, but got {:?}", Some(MSG), bad),
}
assert!(buf.is_empty(),
"Expected empty buf but got {:?}",
{buf.compact(); buf.bytes().unwrap()});
}
}

109
src/protocol/mod.rs
View File

@@ -1,109 +0,0 @@
// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use serde;
use futures::{self, Async};
use bincode::{SizeLimit, serde as bincode};
use std::{io, thread};
use std::collections::VecDeque;
use std::sync::mpsc;
use util::Never;
use tokio_core::io::{FramedIo, Io};
use tokio_core::reactor::{Core, Remote};
use tokio_proto::pipeline::Frame;
lazy_static! {
#[doc(hidden)]
pub static ref LOOP_HANDLE: Remote = {
let (tx, rx) = mpsc::channel();
thread::spawn(move || {
let mut lupe = Core::new().unwrap();
tx.send(lupe.handle().remote().clone()).unwrap();
// Run forever
lupe.run(futures::empty::<(), !>()).unwrap();
});
rx.recv().unwrap()
};
}
pub use self::writer::Packet;
pub mod reader;
pub mod writer;
/// A helper trait to provide the `map_non_block` function on Results.
trait MapNonBlock<T> {
/// Maps a `Result<T>` to a `Result<Option<T>>` by converting
/// operation-would-block errors into `Ok(None)`.
fn map_non_block(self) -> io::Result<Option<T>>;
}
impl<T> MapNonBlock<T> for io::Result<T> {
fn map_non_block(self) -> io::Result<Option<T>> {
use std::io::ErrorKind::WouldBlock;
match self {
Ok(value) => Ok(Some(value)),
Err(err) => {
if let WouldBlock = err.kind() {
Ok(None)
} else {
Err(err)
}
}
}
}
}
/// Deserialize a buffer into a `D` and its ID. On error, returns `tarpc::Error`.
pub fn deserialize<D: serde::Deserialize>(mut buf: &[u8]) -> Result<D, bincode::DeserializeError> {
bincode::deserialize_from(&mut buf, SizeLimit::Infinite)
}
pub struct TarpcTransport<T> {
stream: T,
read_state: reader::ReadState,
outbound: VecDeque<Packet>,
head: Option<Packet>,
}
impl<T> TarpcTransport<T> {
pub fn new(stream: T) -> Self {
TarpcTransport {
stream: stream,
read_state: reader::ReadState::init(),
outbound: VecDeque::new(),
head: None,
}
}
}
impl<T> FramedIo for TarpcTransport<T>
where T: Io
{
type In = Frame<Packet, Never, io::Error>;
type Out = Frame<Vec<u8>, Never, io::Error>;
fn poll_read(&mut self) -> Async<()> {
self.stream.poll_read()
}
fn poll_write(&mut self) -> Async<()> {
self.stream.poll_write()
}
fn read(&mut self) -> io::Result<Async<Frame<Vec<u8>, Never, io::Error>>> {
self.read_state.next(&mut self.stream)
}
fn write(&mut self, req: Self::In) -> io::Result<Async<()>> {
self.outbound.push_back(req.unwrap_msg());
self.flush()
}
fn flush(&mut self) -> io::Result<Async<()>> {
writer::NextWriteState::next(&mut self.head, &mut self.stream, &mut self.outbound)
}
}

154
src/protocol/reader.rs
View File

@@ -1,154 +0,0 @@
// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use byteorder::{BigEndian, ReadBytesExt};
use bytes::{MutBuf, Take};
use futures::Async;
use std::io;
use std::mem;
use tokio_proto::TryRead;
use tokio_proto::pipeline::Frame;
use util::Never;
#[derive(Debug)]
pub struct U64Reader {
read: usize,
data: [u8; 8],
}
impl U64Reader {
fn new() -> Self {
U64Reader {
read: 0,
data: [0; 8],
}
}
}
impl MutBuf for U64Reader {
fn remaining(&self) -> usize {
8 - self.read
}
unsafe fn advance(&mut self, count: usize) {
self.read += count;
}
unsafe fn mut_bytes(&mut self) -> &mut [u8] {
&mut self.data[self.read..]
}
}
#[derive(Debug)]
enum NextReadAction<R> {
Continue,
Stop(Result<R, io::Error>),
}
trait MutBufExt: MutBuf + Sized {
type Inner;
fn take(&mut self) -> Self::Inner;
fn try_read<R: TryRead>(&mut self, stream: &mut R) -> io::Result<NextReadAction<Self::Inner>> {
while let Async::Ready(bytes_read) = stream.try_read_buf(self)? {
debug!("Reader: read {} bytes, {} remaining.",
bytes_read,
self.remaining());
if bytes_read == 0 {
debug!("Reader: connection broken.");
let err = io::Error::new(io::ErrorKind::BrokenPipe, "The connection was closed.");
return Ok(NextReadAction::Stop(Err(err)));
}
if !self.has_remaining() {
trace!("Reader: finished.");
return Ok(NextReadAction::Stop(Ok(self.take())));
}
}
Ok(NextReadAction::Continue)
}
}
impl MutBufExt for U64Reader {
type Inner = u64;
fn take(&mut self) -> u64 {
(&self.data as &[u8]).read_u64::<BigEndian>().unwrap()
}
}
impl MutBufExt for Take<Vec<u8>> {
type Inner = Vec<u8>;
fn take(&mut self) -> Vec<u8> {
mem::replace(self.get_mut(), vec![])
}
}
/// A state machine that reads packets in non-blocking fashion.
#[derive(Debug)]
pub enum ReadState {
/// Tracks how many bytes of the message size have been read.
Len(U64Reader),
/// Tracks read progress.
Data(Take<Vec<u8>>),
}
#[derive(Debug)]
enum NextReadState {
Same,
Next(ReadState),
Reset(Vec<u8>),
}
impl ReadState {
pub fn init() -> ReadState {
ReadState::Len(U64Reader::new())
}
pub fn next<R: TryRead>(&mut self,
socket: &mut R)
-> io::Result<Async<Frame<Vec<u8>, Never, io::Error>>> {
loop {
let next = match *self {
ReadState::Len(ref mut len) => {
match len.try_read(socket)? {
NextReadAction::Continue => NextReadState::Same,
NextReadAction::Stop(result) => {
match result {
Ok(len) => {
let buf = Vec::with_capacity(len as usize);
NextReadState::Next(ReadState::Data(Take::new(buf,
len as usize)))
}
Err(e) => return Ok(Async::Ready(Frame::Error(e))),
}
}
}
}
ReadState::Data(ref mut buf) => {
match buf.try_read(socket)? {
NextReadAction::Continue => NextReadState::Same,
NextReadAction::Stop(result) => {
match result {
Ok(buf) => NextReadState::Reset(buf),
Err(e) => return Ok(Async::Ready(Frame::Error(e))),
}
}
}
}
};
match next {
NextReadState::Same => return Ok(Async::NotReady),
NextReadState::Next(next) => *self = next,
NextReadState::Reset(packet) => {
*self = ReadState::init();
return Ok(Async::Ready(Frame::Message(packet)));
}
}
}
}
}

108
src/protocol/writer.rs
View File

@@ -1,108 +0,0 @@
// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use bincode::SizeLimit;
use bincode::serde as bincode;
use byteorder::{BigEndian, WriteBytesExt};
use bytes::Buf;
use futures::Async;
use serde::Serialize;
use std::collections::VecDeque;
use std::io::{self, Cursor};
use std::mem;
use tokio_proto::TryWrite;
/// The means of communication between client and server.
#[derive(Clone, Debug)]
pub struct Packet {
/// (payload_len: u64, payload)
///
/// The payload is typically a serialized message.
pub buf: Cursor<Vec<u8>>,
}
impl Packet {
/// Creates a new packet, (len, payload)
pub fn serialize<S>(message: &S) -> Result<Packet, bincode::SerializeError>
where S: Serialize
{
let payload_len = bincode::serialized_size(message);
// (len, message)
let mut buf = Vec::with_capacity(mem::size_of::<u64>() + payload_len as usize);
buf.write_u64::<BigEndian>(payload_len).unwrap();
bincode::serialize_into(&mut buf, message, SizeLimit::Infinite)?;
Ok(Packet { buf: Cursor::new(buf) })
}
}
#[derive(Debug)]
enum NextWriteAction {
Stop,
Continue,
}
trait BufExt: Buf + Sized {
/// Writes data to stream. Returns Ok(true) if all data has been written or Ok(false) if
/// there's still data to write.
fn try_write<W: TryWrite>(&mut self, stream: &mut W) -> io::Result<NextWriteAction> {
while let Async::Ready(bytes_written) = stream.try_write_buf(self)? {
debug!("Writer: wrote {} bytes; {} remaining.",
bytes_written,
self.remaining());
if bytes_written == 0 {
trace!("Writer: would block.");
return Ok(NextWriteAction::Continue);
}
if !self.has_remaining() {
return Ok(NextWriteAction::Stop);
}
}
Ok(NextWriteAction::Continue)
}
}
impl<B: Buf> BufExt for B {}
#[derive(Debug)]
pub enum NextWriteState {
Nothing,
Next(Packet),
}
impl NextWriteState {
pub fn next<W: TryWrite>(state: &mut Option<Packet>,
socket: &mut W,
outbound: &mut VecDeque<Packet>)
-> io::Result<Async<()>> {
loop {
let update = match *state {
None => {
match outbound.pop_front() {
Some(packet) => {
let size = packet.buf.remaining() as u64;
debug_assert!(size >= mem::size_of::<u64>() as u64);
NextWriteState::Next(packet)
}
None => return Ok(Async::Ready(())),
}
}
Some(ref mut packet) => {
match BufExt::try_write(&mut packet.buf, socket)? {
NextWriteAction::Stop => NextWriteState::Nothing,
NextWriteAction::Continue => return Ok(Async::NotReady),
}
}
};
match update {
NextWriteState::Next(next) => *state = Some(next),
NextWriteState::Nothing => {
*state = None;
}
}
}
}
}

50
src/server.rs
View File

@@ -3,12 +3,12 @@
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use errors::{SerializableError, WireError};
use bincode::serde::DeserializeError;
use errors::WireError;
use futures::{self, Async, Future};
use futures::stream::Empty;
use protocol::{LOOP_HANDLE, TarpcTransport};
use protocol::writer::Packet;
use serde::Serialize;
use protocol::{LOOP_HANDLE, new_transport};
use serde::{Deserialize, Serialize};
use std::io;
use std::net::ToSocketAddrs;
use tokio_proto::pipeline;
@@ -16,12 +16,18 @@ use tokio_proto::server::{self, ServerHandle};
use tokio_service::NewService;
use util::Never;
/// A message from server to client.
pub type Response<T, E> = pipeline::Message<Result<T, WireError<E>>, Empty<Never, io::Error>>;
/// Spawns a service that binds to the given address and runs on the default tokio `Loop`.
pub fn listen<A, T>(addr: A, new_service: T) -> ListenFuture
where T: NewService<Request = Vec<u8>,
Response = pipeline::Message<Packet, Empty<Never, io::Error>>,
pub fn listen_pipeline<A, S, Req, Resp, E>(addr: A, new_service: S) -> ListenFuture
where S: NewService<Request = Result<Req, DeserializeError>,
Response = Response<Resp, E>,
Error = io::Error> + Send + 'static,
A: ToSocketAddrs
A: ToSocketAddrs,
Req: Deserialize,
Resp: Serialize,
E: Serialize,
{
// TODO(tikue): don't use ToSocketAddrs, or don't unwrap.
let addr = addr.to_socket_addrs().unwrap().next().unwrap();
@@ -29,7 +35,7 @@ pub fn listen<A, T>(addr: A, new_service: T) -> ListenFuture
let (tx, rx) = futures::oneshot();
LOOP_HANDLE.spawn(move |handle| {
Ok(tx.complete(server::listen(handle, addr, move |stream| {
pipeline::Server::new(new_service.new_service()?, TarpcTransport::new(stream))
pipeline::Server::new(new_service.new_service()?, new_transport(stream))
}).unwrap()))
});
ListenFuture { inner: rx }
@@ -51,29 +57,3 @@ impl Future for ListenFuture {
}
}
}
/// Returns a future containing the serialized reply.
///
/// Because serialization can take a non-trivial
/// amount of cpu time, it is run on a thread pool.
#[doc(hidden)]
#[inline]
pub fn serialize_reply<T: Serialize + Send + 'static,
E: SerializableError>(result: Result<T, WireError<E>>)
-> SerializeFuture
{
let packet = match Packet::serialize(&result) {
Ok(packet) => packet,
Err(e) => {
let err: Result<T, WireError<E>> = Err(WireError::ServerSerialize(e.to_string()));
Packet::serialize(&err).unwrap()
}
};
futures::finished(pipeline::Message::WithoutBody(packet))
}
#[doc(hidden)]
pub type SerializeFuture = futures::Finished<SerializedReply, io::Error>;
#[doc(hidden)]
pub type SerializedReply = pipeline::Message<Packet, Empty<Never, io::Error>>;

41
src/util.rs
View File

@@ -3,6 +3,8 @@
// Licensed under the MIT License, <LICENSE or http://opensource.org/licenses/MIT>.
// This file may not be copied, modified, or distributed except according to those terms.
use futures::{Future, Poll};
use futures::stream::Stream;
use std::fmt;
use std::error::Error;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
@@ -14,13 +16,43 @@ pub struct Never(!);
impl Error for Never {
fn description(&self) -> &str {
unreachable!()
match self.0 {
// TODO(tikue): remove when https://github.com/rust-lang/rust/issues/12609 lands
_ => unreachable!(),
}
}
}
impl fmt::Display for Never {
fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
unreachable!()
match self.0 {
// TODO(tikue): remove when https://github.com/rust-lang/rust/issues/12609 lands
_ => unreachable!(),
}
}
}
impl Future for Never {
type Item = Never;
type Error = Never;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
match self.0 {
// TODO(tikue): remove when https://github.com/rust-lang/rust/issues/12609 lands
_ => unreachable!(),
}
}
}
impl Stream for Never {
type Item = Never;
type Error = Never;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
match self.0 {
// TODO(tikue): remove when https://github.com/rust-lang/rust/issues/12609 lands
_ => unreachable!(),
}
}
}
@@ -28,7 +60,10 @@ impl Serialize for Never {
fn serialize<S>(&self, _: &mut S) -> Result<(), S::Error>
where S: Serializer
{
unreachable!()
match self.0 {
// TODO(tikue): remove when https://github.com/rust-lang/rust/issues/12609 lands
_ => unreachable!(),
}
}
}